3

I am trying to create a legend inside a tikzpicture. The picture shows an accelerator and I would like to make a legend that will explain each part.

My code is

\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{positioning}


\begin{document}
\definecolor{tank}{RGB}{98,190,177}
  \makeatletter

\pgfdeclareshape{slit}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{north}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=.2cm\advance\pgf@y by\halfheight}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[rounded corners=.1cm](-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight);
        \draw[rounded corners=.04cm](-.8*\halfwidth,-.4*\halfheight)rectangle(.8*\halfwidth,-.8*\halfheight)(-.8*\halfwidth,.4*\halfheight)rectangle(.8*\halfwidth,.8*\halfheight);}}

\pgfdeclareshape{quadrapole}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{north}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=.2cm\advance\pgf@y by\halfheight}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[rounded corners=.1cm,fill=white](-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight);
        \draw[rounded corners=.04cm,fill=red](-.8*\halfwidth,-.4*\halfheight)rectangle(.8*\halfwidth,-.8*\halfheight)(-.8*\halfwidth,-.2*\halfheight)rectangle(.8*\halfwidth,.2*\halfheight)(-.8*\halfwidth,.4*\halfheight)rectangle(.8*\halfwidth,.8*\halfheight);}}

\pgfdeclareshape{lens}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.05cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.2cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{south}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgfmathsetlength\pgf@y{-1.5*\halfheight-.2cm}}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[fill=white](0,-1.5*\halfheight)--(0,-\halfheight)(0,\halfheight)--(0,1.5*\halfheight)(-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight);}}

\pgfdeclareshape{pump}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.1cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.3cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{south}{
        \pgf@process\halfheight
        \pgf@process\halfwidth
        \pgf@x=0cm
        \pgfmathsetlength\pgf@y{-\halfheight-\halfwidth-.2cm}}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[ultra thick](0,0)--(0,-\halfheight);
        \draw[fill=white](0,-\halfheight)circle(\halfwidth);}}

\pgfdeclareshape{source}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.3cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.1cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{north}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=.2cm\advance\pgf@y by\halfheight}
    \anchor{south}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=-.2cm\advance\pgf@y by-\halfheight}
    \backgroundpath{
        \draw[fill=white](-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight)(-.8*\halfwidth,-1.5*\halfheight)--(-.8*\halfwidth,1.5*\halfheight)(-.4*\halfwidth,-1.5*\halfheight)--(-.4*\halfwidth,1.5*\halfheight)(0,-1.5*\halfheight)--(0,1.5*\halfheight)(.4*\halfwidth,-1.5*\halfheight)--(.4*\halfwidth,1.5*\halfheight)(.8*\halfwidth,-1.5*\halfheight)--(.8*\halfwidth,1.5*\halfheight);}}

\tikzset{steers/.style={fill=white,draw,shape=rectangle,rounded corners=.1cm}}

  \begin{tikzpicture}
        % source PSU
        \draw[step=.2cm](-10.4,2.1)grid(-6.6,3.3)(-6,2.7)node{1};
        % slits
        \path[slit,minimum height=.9cm,minimum width=.9cm](-6.5,0)node(sl){}(5.5,0)node{}(8,-2)node[rotate=90]{};
        % pumps
        \path[pump,minimum height=.8cm](-8-1.7320508*.6,.6)node[rotate=150]{}(-8-1.7320508*.6,-.6)node[rotate=30]{};
        \path[pump,minimum height=1.3cm,minimum width=.4cm](-3.9,0)node(lo){}(2.3,0)node{}(6.6,0)node[rotate=180]{}(8,-3.1)node[rotate=270]{};
        % Tubes
        \draw[thick,double,double distance=.1cm](-9.7320508,-1)--(-8,0)--(-9.7320508,1);
        \draw[thick,double,double distance=.2cm,rounded corners=.4cm](-8,0)-|(8,-5);
        \draw[thick,double,double distance=.3cm,rounded corners=.4cm,line cap=rect](7.1,0)-|node[shift={(.2,.2)}]{11}(8,-.6);
        % lines
        \draw[thick,double,double distance=.1cm,line cap=rect,fill](8,-5.5)--+(-40:3.5)+(0,0)--+(-70:3.5)+(0,0)--+(-110:3.5)+(0,0)--+(-130:3.5)+(0,0)--+(-150:3.5)+(0,0)--+(-25:3.5);
        \draw[fill=white](8,-5.5)+(-70:3.5)circle(.4)node[shift={(.5,.5)}]{13};
        % quadrapoles
        \path[quadrapole,minimum height=.9cm,minimum width=.9cm](3,0)node(re){}(8,-4.3)node[rotate=90]{};
        % lenses
        \path[lens](-8-1.7320508*.5,.5)node[rotate=-30]{}(-8-1.7320508*.5,-.5)node[rotate=30]{};
        \path[lens,minimum height=.3cm,minimum width=.1cm](-7.3,0)node(le){}(-4.3,0)node{};
        % sources
        \path[source,minimum height=.4cm,minimum width=1.2cm](-9.7320508,1)node(source1)[rotate=-30]{}(-9.7320508,-1)node(source2)[rotate=30]{};
        % steerers
        \path(-5.3,0)node[steers](st){\phantom{(}}++(.1,.5)node{7}(4.2,0)node[steers]{\phantom{)}};
        % tank
        \draw[fill=tank](-1.8,1.3)--(-3.6,.7)--(-3.6,-.7)--(-1.8,-1.3)rectangle node[shift={(0,1.6)}]{9}(.1,1.3)--(1.9,.7)--(1.9,-.7)--(.1,-1.3);
        % inflector
        \draw[fill=white](-8,0)+(-.1,-.3)--+(-.1,.3)--+(-.3,.3)--+(-.4,.1)--+(-.4,-.1)--+(-.3,-.3)--+(0,-.3)--+(.1,-.1)--+(.1,.1)--+(-.1,.3)node[above]{4};
        % switcher
        \draw[fill=white](8,-5)+(-.5,-.6)--+(.5,-.6)..controls+(.3,-.4)and+(-.3,-.4)..+(-.5,-.6)--+(-.3,0)--+(.3,0)--+(.5,-.6)node[above right]{12};
        % walls
        \draw[line width=.17cm](3,-5.6)--(6.9,-5.6)arc[start angle=-180,end angle=0,
x radius=1.1cm,y radius=.9cm]--(10.7,-5.6)(8,-6.5)--(8,-10.5);
        % left labels
        \path(sl.north)node{6}(lo.south)node{8}(re.north)node{10}(le.south)node{5}(source1.north)node{2}(source2.south)node{3};
        %Legend
        \node[anchor=east] at (-9,-6) (leg1) {$1$. PSU};
        \node[below=1mm of leg1] (leg2) {$2$. Sputter Source};
        \node[right=6mm of leg1,anchor=west] (leg8) {$8$. Pumps};
    \end{tikzpicture}
\end{document}

and my output is

enter image description here

I am trying to align the legend entries but I don't know how to do it! I've played around with anchors but without any luck at all. Any ideas?

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3

3 Answers 3

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6

It is sometimes easy to forget that nodes are very flexible and powerful with respect to the text they can contain. Pure TikZ solutions are possible, of course, as the other answers show. But TikZ/TeX solutions to the problem exist as well. Try this with a minipage environment:

\node at (-9,-6) (leg) {%
    \minipage{4cm} %% alter to suit
        1. PSU\\2. Sputter Source\\...\\8. Pumps
    \endminipage
};

Or this with a tabular environment:

\node at (-9,-6) (leg) {%
    \tabular{ll}
        1. PSU& 8. Pumps\\
        2. Sputter Source& 9.\\
        3. & 10.\\
        4. & 11.\\
        5. & 12.\\
        6. & 13.\\
        7. 
    \endtabular
};

Either can be surrounded by \fbox{...}.

Best of both worlds.

I should have noted one very simple TikZ approach:

\node[text width=4cm,draw] at (-9,-6) (leg) {% Alter the 4cm to suit
    1. PSU\\2. Sputter Source\\3. \\4. \\...\\8. Pumps
};
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1
  • Thank you very much for your answer! I accepted it beacause it is the simplest of all!
    – Thanos
    Sep 12, 2014 at 9:08
7

You might use anchors something like this to align the items in the legend on the left (i.e. west) side:

   %Legend
    \node[anchor=east] at (-9,-6) (leg1) {$1$. PSU};
    \node[below=1mm of leg1.south west, anchor=north west] (leg2) {$2$. Sputter Source};
    \node[right=6mm of leg1,anchor=west] (leg8) {$8$. Pumps};

aligned legend

However, you will probably need something more like this in the end:

\node[anchor=east] at (-9,-6) (leg1) {$1$. PSU};
\node[below=1mm of leg1.south west, anchor=north west] (leg2) {$2$. Sputter Source};
\node[xshift=6mm,anchor=west] (leg8) at (leg2.east |- leg1) {$8$. Pumps};

more aligned

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4

I created a legend using @ClaudioFiandrino 's suggestion. My code is

\documentclass{standalone}

\usepackage{tikz}
\usetikzlibrary{positioning}
\usetikzlibrary{calc,shadings}
\usepackage{pgfplots}

\newenvironment{customlegend}[1][]{%
    \begingroup
    % inits/clears the lists (which might be populated from previous
    % axes):
    \csname pgfplots@init@cleared@structures\endcsname
    \pgfplotsset{#1}%
}{%
    % draws the legend:
    \csname pgfplots@createlegend\endcsname
    \endgroup
}%

% makes \addlegendimage available (typically only available within an
% axis environment):
\def\addlegendimage{\csname pgfplots@addlegendimage\endcsname}

%%--------------------------------

% definition to insert numbers
\pgfkeys{/pgfplots/number in legend/.style={%
        /pgfplots/legend image code/.code={%
            \node at (0.125,-0.0225){#1}; % <= changed x value
        },%
    },
}
\pgfplotsset{
every legend to name picture/.style={west}
}

\begin{document}
\definecolor{tank}{RGB}{98,190,177}
  \makeatletter

\pgfdeclareshape{slit}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{north}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=.2cm\advance\pgf@y by\halfheight}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[rounded corners=.1cm](-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight);
        \draw[rounded corners=.04cm](-.8*\halfwidth,-.4*\halfheight)rectangle(.8*\halfwidth,-.8*\halfheight)(-.8*\halfwidth,.4*\halfheight)rectangle(.8*\halfwidth,.8*\halfheight);}}

\pgfdeclareshape{quadrapole}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.25cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{north}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=.2cm\advance\pgf@y by\halfheight}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[rounded corners=.1cm,fill=white](-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight);
        \draw[rounded corners=.04cm,fill=red](-.8*\halfwidth,-.4*\halfheight)rectangle(.8*\halfwidth,-.8*\halfheight)(-.8*\halfwidth,-.2*\halfheight)rectangle(.8*\halfwidth,.2*\halfheight)(-.8*\halfwidth,.4*\halfheight)rectangle(.8*\halfwidth,.8*\halfheight);}}

\pgfdeclareshape{lens}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.05cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.2cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{south}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgfmathsetlength\pgf@y{-1.5*\halfheight-.2cm}}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[fill=white](0,-1.5*\halfheight)--(0,-\halfheight)(0,\halfheight)--(0,1.5*\halfheight)(-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight);}}

\pgfdeclareshape{pump}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.1cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.3cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{south}{
        \pgf@process\halfheight
        \pgf@process\halfwidth
        \pgf@x=0cm
        \pgfmathsetlength\pgf@y{-\halfheight-\halfwidth-.2cm}}
    \anchorborder{\centerpoint}
    \backgroundpath{
        \draw[ultra thick](0,0)--(0,-\halfheight);
        \draw[fill=white](0,-\halfheight)circle(\halfwidth);}}

\pgfdeclareshape{source}{
    \savedanchor\centerpoint{\pgf@x=0cm\pgf@y=0cm}
    \saveddimen\halfwidth{
        \pgf@x=.3cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum width}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \saveddimen\halfheight{
        \pgf@x=.1cm
        \pgfmathsetlength\pgf@xa{.5*\pgfkeysvalueof{/pgf/minimum height}}
        \ifdim\pgf@x<\pgf@xa\pgf@x=\pgf@xa\fi}
    \anchor{center}\centerpoint
    \anchor{north}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=.2cm\advance\pgf@y by\halfheight}
    \anchor{south}{
        \pgf@process\halfheight
        \pgf@x=0cm
        \pgf@y=-.2cm\advance\pgf@y by-\halfheight}
    \backgroundpath{
        \draw[fill=white](-\halfwidth,-\halfheight)rectangle(\halfwidth,\halfheight)(-.8*\halfwidth,-1.5*\halfheight)--(-.8*\halfwidth,1.5*\halfheight)(-.4*\halfwidth,-1.5*\halfheight)--(-.4*\halfwidth,1.5*\halfheight)(0,-1.5*\halfheight)--(0,1.5*\halfheight)(.4*\halfwidth,-1.5*\halfheight)--(.4*\halfwidth,1.5*\halfheight)(.8*\halfwidth,-1.5*\halfheight)--(.8*\halfwidth,1.5*\halfheight);}}

\tikzset{steers/.style={fill=white,draw,shape=rectangle,rounded corners=.1cm}}

  \begin{tikzpicture}
        % source PSU
        \draw[step=.2cm](-10.4,2.1)grid(-6.6,3.3)(-6,2.7)node{1};
        % slits
        \path[slit,minimum height=.9cm,minimum width=.9cm](-6.5,0)node(sl){}(5.5,0)node{}(8,-2)node[rotate=90]{};
        % pumps
        \path[pump,minimum height=.8cm](-8-1.7320508*.6,.6)node[rotate=150]{}(-8-1.7320508*.6,-.6)node[rotate=30]{};
        \path[pump,minimum height=1.3cm,minimum width=.4cm](-3.9,0)node(lo){}(2.3,0)node{}(6.6,0)node[rotate=180]{}(8,-3.1)node[rotate=270]{};
        % Tubes
        \draw[thick,double,double distance=.1cm](-9.7320508,-1)--(-8,0)--(-9.7320508,1);
        \draw[thick,double,double distance=.2cm,rounded corners=.4cm](-8,0)-|(8,-5);
        \draw[thick,double,double distance=.3cm,rounded corners=.4cm,line cap=rect](7.1,0)-|node[shift={(.2,.2)}]{11}(8,-.6);
        % lines
        \draw[thick,double,double distance=.1cm,line cap=rect,fill](8,-5.5)--+(-40:3.5)+(0,0)--+(-70:3.5)+(0,0)--+(-110:3.5)+(0,0)--+(-130:3.5)+(0,0)--+(-150:3.5)+(0,0)--+(-25:3.5);
        \draw[fill=white](8,-5.5)+(-70:3.5)circle(.4)node[shift={(.5,.5)}]{13};
        % quadrapoles
        \path[quadrapole,minimum height=.9cm,minimum width=.9cm](3,0)node(re){}(8,-4.3)node[rotate=90]{};
        % lenses
        \path[lens](-8-1.7320508*.5,.5)node[rotate=-30]{}(-8-1.7320508*.5,-.5)node[rotate=30]{};
        \path[lens,minimum height=.3cm,minimum width=.1cm](-7.3,0)node(le){}(-4.3,0)node{};
        % sources
        \path[source,minimum height=.4cm,minimum width=1.2cm](-9.7320508,1)node(source1)[rotate=-30]{}(-9.7320508,-1)node(source2)[rotate=30]{};
        % steerers
        \path(-5.3,0)node[steers](st){\phantom{(}}++(.1,.5)node{7}(4.2,0)node[steers]{\phantom{)}};
        % tank
        \draw[fill=tank](-1.8,1.3)--(-3.6,.7)--(-3.6,-.7)--(-1.8,-1.3)rectangle node[shift={(0,1.6)}]{9}(.1,1.3)--(1.9,.7)--(1.9,-.7)--(.1,-1.3);
        % inflector
        \draw[fill=white](-8,0)+(-.1,-.3)--+(-.1,.3)--+(-.3,.3)--+(-.4,.1)--+(-.4,-.1)--+(-.3,-.3)--+(0,-.3)--+(.1,-.1)--+(.1,.1)--+(-.1,.3)node[above]{4};
        % switcher
        \draw[fill=white](8,-5)+(-.5,-.6)--+(.5,-.6)..controls+(.3,-.4)and+(-.3,-.4)..+(-.5,-.6)--+(-.3,0)--+(.3,0)--+(.5,-.6)node[above right]{12};
        % walls
        \draw[line width=.17cm](3,-5.6)--(6.9,-5.6)arc[start angle=-180,end angle=0,
x radius=1.1cm,y radius=.9cm]--(10.7,-5.6)(8,-6.5)--(8,-10.5);
        % left labels
        \path(sl.north)node{6}(lo.south)node{8}(re.north)node{10}(le.south)node{5}(source1.north)node{2}(source2.south)node{3};
        %Legend
%         \node[anchor=east] at (-9,-6) (leg1) {$1$. PSU};
%         \node[below=1mm of leg1] (leg2) {$2$. Sputter Source};
%         \node[right=6mm of leg1,anchor=west] (leg8) {$8$. Pumps};

\begin{customlegend}[legend cell align=left, %<= to align cells
legend entries={ % <= in the following there are the entries
Sources Supplies,
Sputter Source,
Duoplasmatron off axis Source, 
Inflector,
Electrostatic Lens,
Slits,
Steerer,
Vacuum Pumps,
Tank,
Quadrapole Magnets,
Analyser,
Switcher,
Experimental Line
},
legend style={at={(-2,-4.5)},font=\normalsize}] % <= to define position and font legend
% the following are the "images" and numbers in the legend
    \addlegendimage{number in legend=1}
    \addlegendimage{number in legend=2}
    \addlegendimage{number in legend=3}
    \addlegendimage{number in legend=4}
    \addlegendimage{number in legend=5}
    \addlegendimage{number in legend=6}
    \addlegendimage{number in legend=7}
    \addlegendimage{number in legend=8}
    \addlegendimage{number in legend=9}
    \addlegendimage{number in legend=10}
    \addlegendimage{number in legend=11}
    \addlegendimage{number in legend=12}
    \addlegendimage{number in legend=13}
\end{customlegend}
    \end{tikzpicture}
\end{document}

and the output is

enter image description here

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